Centrifugal casting method and apparatus



I a. EYNON. CENTRIFUGAL CASTING METHOD AND APPARATUS.

APPLICATION FILED SEPT-16,1918.

Patented Augg 10,1920,

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L\ m m/mvra/a HAROLD a mom H; e. EYNON. CENTRIFUGAL CASING METHOD AND APPARMUS.

APP LICATION FILED SEPT. 16, 1918.. 1,349,416. v Patented Aug. 10, 1920.

3 SHEETS-SHEET 2.

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HAROLD Giff/l0.

' ORA/5K HAROLD GRIFFITH EYNON, F PHILADELPHIA, PENNSYLVANIA.

QENTRIFfUG-AL CASTING METHOD AND APPARATUS.

To all whom it concern:

jecting it to Be it' known that I, HAROLD GR FFITH EYNoN, a citizen of the United States; re siding at 3211 N. Carlisle St., Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Centrifugal Casting Method and Apparatus, of which the following is a specification. r

y invention relates to methods and machines for casting molten fluid while subcentrifugal action.

One of the mount the cylinder of acasting machine between supports and driving means, both of whose surfaces of contact with the cylinder of the machine are artificially increased in area for the purpose of conducting to and distributing from them a part of the heat intended to be dissipated from the cylinder.

A further tial ribs placed upon the cylinder forheat radiating purposes for the purpose also of affording a convenient (and effective enlarged friction drive surface engaged by an intermittently operating drive member; utilizing the frlction drive member as an additional heat conducting, convecting and radiating surface. i

A further purpose is to apply a belted drive for the cylinder, using the pull of the belt to hold the frictional driving member,normally away from the surface ofthe cylinder. Y A further purpose is to provide for the use of different lengths and diameters of casting with the same casting cylinder and additional heat distributing provision.

Further purposes will appear in the specification and in the claims thereof.

My invention resides "both in the method involved and in the apparatus by which the method may be carried out.

I have preferred to illustrate my invention by but one main form thereof, selecting therefor a form which ispractical, eflicient and highly beneficial and which at the same time well illustrates the principles of my in-' vention. v

Figure 1 is a central Fig. 2. a

Fig. 2 is an end elevation of the 'pre ferred form of my invention.

Fig. 3 is a section upon line 3-3 of big. 10

vertical section of them free from blow purposes of my invention is to i and which is purpose Is to use circumferenshafts 15 and 16 ate the approximate centers Specification of Letters latent. Patented A 10 1920 Application filed September 16, 1918. Serial No. 254,329.

Figs. 4 and 5 .are fragmentary longitudinal sections showing modified forms.

The casting of bushings, cylinders and otherrelatively long hollow forms has been difficult under even the most advantageous conditions. It has been difficult to render holes and they have been cast by estimate of the uantity of metal needed rather than to a de nite thickness. The estimate has also provided for additional thickness on account of the trimming required to remove the extra metal necessarily allowed, The surface of dross was hard on the cutting tool.

In correcting as tothese various features have had in mind the production of a machine which shall be Well' balanced and convenient, which stopped quickly and easily, which shall have a maximum of heat-distributing surface generally adaptable to good foundry practice.

lteferrmg to the drawin s for illustration but not in limitation :-The frame 10 is provided with convenientend housings 11 and 12 which are connected and stiffened'by four shafts 13, 14, 15 and 16, of which form the bearings for supporting rolls 1717 and 184-18 upon which the molding or castin cylinder 19 rests.

For the purpose of zfistributing and dismay be started and.

sipating the heat as rapidly as possible by convection and radiation as well as by conduction the exterior surface of the casting cylinder 19 is circumferentially ribbed to provide projecting rings 20 and intermedigrooves 21; and the supporting rolls 17-17, 18-18 are cooperatively provided with circumferential ribs 22 to fit within the grooves, so that there shall'be as large .an area of surface contact for conduction between the cylinder and each supporting .roll as possible and a correspondingly en- .larged supporting roll surface for convection and radiation of heat.

The rolls 17, 18 are shown as oiled by means of oil cups 23 and passages within the shaft extending longitudinally at 24 to of the rolls and transversely at 25 to the bearing surfaces.

In order to provide for replacement of the interlorsurface of the cylinder as the casting operation .wears or otherwise affects it,

as well as to permit the use of different interior surfaces having differing diameters and lengths, according to the diameter and the main illustration this longer than 1 selected 'to retain .and lighter (aerated) metal length of the cylinders, bushings or other parts being cast, .1 line the casting cylinder with a bushing 26 ofv any suitable form. This bushing can be inserted and withdrawn from either end of the cylinder, and will vary in length and diameter for the different typesof machine and ferent articles with the same machine. In bushing is shown a the same length as the cylinder but it may be made shorter or that length to coeperate with different heads for the purpose of producing shorter or longer castings.

Whatever the form of'bushing, here used, or if the cylinder be used without the bushing, I employ heads of which I have shown format 27 and 28. These are shown as secured to the cylinder but may be conveniently secured to other parts. In the illustration they are provided with flanges 29 to coeperate with flanges 30 upon the cylinder to which they are secured by bolts 31.

The heads are preferably provided withgenerally cylindrical collars 82 which fit the ends of the bushings. -These collars by their as "of approximately lengths limit the intended castings to any desired lengths less than the bushings, and by their thickness may determine the thickness of the castings, beyond whichthe metal pours out of the ends of the cylinder. 4

The internal diameter 33 of the heads is just suflicient' metal for any trimming desired above which any excess metal poured flows out through one or both of the ends,

which would otherwise be left to form the interior surface of the casting.

' or replaced through the openings 3 i onthe shafts, limiting In order to accommodate this flow to the best advantage I provide the heads with chamfered outer surfaces 34 which may desirably .overhang sufliciently at the ends to throw the metal clear parts of the machine.

The molten metal for the casting 35 is de livered into the interior of the casting cylinder through a trough 36 from aladle not shown.

Both for the purpose of giving this trough a longer reach and in order to permit the bushings 26 to 1n the housing where desired, these openings are made larger than the bushings.

. The casting cylinder may be positioned, longitudinally, by collars 38, and shoulders or by the driving means, as preferred.

I show a belt-operated friction drivefor the casting cylinder applied to the top of the cylinder. Though other gearing then belting and other enga ement than fricto. secure part of for casting difcarrying with it the dross of all the, movable be extended,7 placed 0 thickness than is thecase in the supporting rolls,

this drive as the best, permitting the drum ance them with relation to the belt and cylinder. Each of these ends is provided with circumferential ribs 41 with tapered openings between for the purpose of bringing the surfaces 42 and 43 of the ribs into frictional engagement with cooperating tapered surfaces 44 and 45 upon the ribs 20 of the casting cylinder. This is a double advantags in that there is additional friction for driving purposes and in that there may be a relatively large contact surface for heat transfer between. The ribs 41 givea large heat radiating surface forthe diffusion of the heat which is received from the mold cylinder. Their time of contact with the ribs of the cylinder is. short enough however for them not to become excessively heatedthroughout and they quickly cool through their subsequent rotation free from the cylinder. f

The driver 39 is mounted upon a shaft 46 which is carried by arms- 47 pivoted upon the rod 13. so that the driving member may be moved into engagement with the casting drum orcylinder by means of a handle 48. The member is provided with a central pulley 49 for a belt 50, whose tension normally lifts the clutch ends 40 free from the drum or cylinder.

The driver 39 is recessedat 51 tov receive oil from cup 52 through channels 53 and 54. Though a cooling blast is not ordinarily required nor desired, I'show provision for it, where it is thought desirable, through nozzle '55.

In Fig. 4 the flanges 29 and 30 are notched to It is fastened by a cam lever 31"" having outward setting movement.

In Fig. 5 the bushing 26' is shown as extended beyond the casting cylinder, the head 28"v engaging by bolts 31*. tributionfrom such an extended bushing would necessarily limit'the amount of any such extension. In the form illustrated greater thickness of the bushing 26' and the greater thickness of the collar 32 would result in the cylinder or bushing cast being not only of smaller distinct? bult greater In operation, the lining bushing and heads are selected. for the length, diameter and thickness of cylinder to becast and the metal it only and being held in place.

The lack of special heat dispass a bolt 31 whichis pivoted at 31 is cast (the cylinder being rotated by the friction drive) until there has been sufficient overflow to secure the desired clear metal interior. The cylinder is then stopped, one

I orboth of the heads is or are removed and that shown and that the apparatus may be greatly varied to suit the needs of particular installations.

Though it will be evident that the materials from which my casting drum and associated parts are not material to the structural features of invention and method claimed, I might state that it is desirable to make the cylinder or drum of steel and the bushing or lining of cast-iron.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: l

1. In' a centrifugal casting machine, a casting drum and a heat conducting removable bushing therefor determining by the length and diameter of the bushing selected the length and diameter of the casting to be made.

2. In a centrifugal casting machine, a rotatable casting drum and corrugated driving means for the drum engaging the exterior surface of the drum and adapted to be disengaged from the drum.

3. In a centrifugal casting machine, a rotatable casting drum and a driving means therefor adapted to engage with and disengage from the upper exterior surface of the drum at two points along the length of the drum and receiving energy between these points.

4:. Ina centrifugal casting machine, a rotatable casting drum and driving means above the drum and engaging its upper surout of engage- 5. In a centrifugal casting machine, a rotatable casting drum, having a friction exterior surface in combination with a friction drive therefor above the drum and supports below the drum, both artificially increased in friction engaging surface with the drum to give additional heat conductivity between the drum and driving member.

6. In a centrifugal casting machine, a rotatable casting drum having heat radiating ribs upon its exterior surface in combination with a continually operative, intermittently connected driving member frictionally engaging the ribs.

7. In a centrifugal casting machine, a rotatable casting drum having circumferentially extending radiating ribs upon its outer surface in combination with a friction drive therefor and separate supports therefor, both having heat radiating, circumferentially extending ribs engaging with the ribs of the drum to drive the same and to receive heat therefrom.

8. In a centrifugal casting machine, a heat radiating drum in combination with a belt operated frictionsdrive therefor, normally held away from the drum by the tension of the belt.

9. In a centrifugal casting machine, a rotatable casting drum in combination with a friction drive therefor,.movable into and out of contact therewith and interfitting with the surface of the drum.

10. In a centrifugal casting machine, a rotatable casting drum in combination with a friction drive therefor, movable into and 

